326 is a molybdenum-bearing austenitic stainless steel, built around roughly 17.5% chromium, 12% nickel, and 2.25-3.00% molybdenum. That chromium/nickel/molybdenum combination places it in the same general family as the well-known 316-type grades: the molybdenum specifically improves resistance to pitting and crevice corrosion in chloride-containing environments — seawater, de-icing salts, and many industrial chemical process streams — well beyond what straight 18-8 chromium-nickel grades like 304 can handle. Where 326 diverges from a textbook 316 specification is in its slightly higher allowances for carbon (0.12%), phosphorus (0.06%), and sulfur (0.06%), so it should be treated as its own catalog grade rather than assumed to be a drop-in equivalent to 316.

We were not able to independently verify a published SAE/AISI, DIN, or Wnr. cross-reference for this specific catalog designation, so we're not listing standard equivalents we can't confirm — if you need a certified equivalent for a specification callout, check your mill certificate against the composition below. Applications for a molybdenum-bearing austenitic stainless in this composition range typically include marine hardware, chemical processing equipment, and piping or fittings exposed to mild chloride environments where 304-class material would be at risk of pitting.

326 cuts like most other molybdenum-bearing austenitic stainless steels: tougher than a plain chromium-nickel grade, with the added complication that molybdenum increases strength and reduces thermal conductivity slightly further than nickel alone would. That means heat generated at the cutting edge has an even harder time escaping into the chip, and it concentrates right where the insert is doing the most work. Combined with the usual austenitic work-hardening tendency — a hardened skin forms wherever the tool rubs instead of shears — this pushes tool selection toward grades that resist both crater wear from heat and abrasive flank wear from the alloy's carbide-forming elements.

The slightly elevated sulfur level in this grade (0.06%, above the 0.03% ceiling typical of standard 316) offers a small assist to chip breaking versus a fully low-sulfur molybdenum stainless, though not to the degree seen in a purpose-built free-machining grade. Sharp, positive-rake tooling, adequate feed to avoid dwelling in the cut, and generous coolant to manage heat at the interface remain the fundamentals. Chip control still needs attention, since molybdenum-bearing austenitics tend toward long, tough chips that can be harder to break than a plain 304-type material.